Download PDF by M. Demerec (Ed.): Advances in Genetics, Vol. 5

By M. Demerec (Ed.)

ISBN-10: 012017605X

ISBN-13: 9780120176052

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He found a seasonal difference in mortality rate, with only one-fourth of those born in spring, summer, and early fall surviving to 4 weeks, whereas one-fourth of those born after the middle of September survived t o 21 to 25 weeks of age. Mortality of both young and adults was high during the spring months owing to increased predation and occasional late snow and sleet storm’s a t a time when dispersal movements away from the place of birth were under way. 2% remained no more than 6 months. 5% survived as much as 4 months.

Fasciaria. Xmthorhoe ferrugata C1. (Qeometridae), found in Britain and Continental Europe, exists in two forms: the broad bands on the fore wings are purple or black in the commoner and red in the rarer. Their proportions seems to vary considerably in different localities but, have never been accurately assessed. Doncaster (1907) pointed out that the extensive breeding work conducted by Prout (1906) on this species indicates that the red-banded phase is dominant. Occasionally intermediates are found, and it is likely that such variation is due to the segregation of other genes affecting the expression of the one chiefly responsible for controlling the dimorphism.

That population pressures also influenced dispersal is indicated by the wide range of variation in distance of dispersal and by the fact that numerous individuals failed to disperse beyond the limits of the parental home range. Drastic changes in population density (and pressure) may affect the behavior and local distribution of resident animals, and it is to be inferred that there would be major effects on young, unestablished individuals. Bole (1939) has written extensively on the problem of “drift” in making estimates of population density involving the removal of individuals from a quadrat.

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Advances in Genetics, Vol. 5 by M. Demerec (Ed.)

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